Summary[edit] Description: English: Illustrations of full-grown nymphs of several species of Somatochlora dragonfly: 115: S. minor 116: S. elongata 117: S. williamsoni 118: S. linearis. Date: 1925. Source: E. M. Walker The North American Dragonflies of the Genus Somatochlora. Author: E. M. Walker.